I am very happy with my Galaxy S , which I have for about a year now.
Recently I noticed that some of the installed applications seem to loose data.
Because I do not know the file system nor the inner working of an Android device, I will give the specific apps in the hope that someone recognizes this or at least can tell me something to try.
The first program I noticed was Friend Caster. This is a (very good) Facebook client which worked fine for some weeks. But now, I have to , at least once a day, re-enter my user id and password. The technical staff helped with some things to try (related to the Facebook integration), but nothing helps.
The second program I noticed was Business Calendar Free. Every once in a while (and I really can't put my finger on why) this program starts up as if it is just installed - i.e. it produces the start help screen, and I loose the settings I choose (f.i. the chosen colours for Saturday and Sunday). Although the installed and active calendars are kept. Also, the widgets of this program, stop updating them self, which is rather useless for a calendar widget, of course :)
I have lots of other programs installed, all of those seem to work correctly. None of them has an obvious function which could cause this.
Samsung Galaxy S - GT-I9000 - Firmware 2.2.1 - Kernel 2.6.32.9 - phone is not rooted
The problem can be specific to those two program of course, but I installed both of them also on another Galaxy S (the one from my son) , on the Android LG of my wife and on my table Archos 101. None of these phones present the same problem.